A palindrome is a word, number, phrase, or other sequence of symbols that reads the same backwards as forwards, such as madam or racecar, the date "22/02/2022" and the sentence: "A man, a plan, a canal – Panama" (https://en.wikipedia.org/wiki/Palindrome)
There are 2 approaches to this problem:
- you compare numbers (sequence of digits) only
- you compare strings (any text)
Please note, the 2nd case can be used to cover the first one as numbers can be converted to strings. It's up to you or your homework's description to find what you need to do.
I'll explain how you can do the string check for palindromes.
Since a palindrome is read forward and backward the same, one of the simplest solutions is the following:
- find the length of the string to be checked (let's call it input), and call it len.
- Let's have a loop where we start reading the characters from the beginning of the string (let's call this index head) and from the end as well (let's call this index tail), where tail starts from len - 1 (which is the last character's index)
- Every iteration we need to check if the characters pointed by head and tail are the same. These would be expressed by the check input[head] == input[tail].
- If they do not match, input is not a palindrome. We can conclude it right away, no need to keep checking, we can break the loop.
- If the characters pointed by head and tail do match, then we keep checking the next ones. Let's increment head and decrement tail and start the next iteration of the loop. We keep doing this as long as head < tail. If this condition is not met anymore, we quit the loop knowing every character pair so far matched, so we have a palindrome.
I hope the above pseudo code helps you how to implement a solution to this problem. Look at some tutorials, such as https://www.tutorialspoint.com/cprogramming/index.htm and reference manuals, such as https://cplusplus.com/reference/clibrary/
If you get stuck, post what you've done so far, share what the problem is, and we'll be happy to assist you.
Good luck!